Hi All,
I run a Dax Rush Sprint and Hillclimb Car with 2wd Cossie YB Turbo. Currently it has standard T3 Turbo with dash 31 actuator and 803 Dark Greens plus 3 bar map sensor. I am told it should be around 300bhp with this spec but is actually only about 250. The engine is very torquey and performs well off the line but I am thinking of an increase in spec to either 320 ish or maybe 360.
My choice seems to be upgrade existing T3 plus new chip for approx 320bhp or replace turbo with a T34 plus new chip and black injectors for 360 ish.

I would like more power, but dont want to loose any performance lower down or have more lag. Which do I go for?

 

I would stick with the t3 and look more towards having it live map'ed, what type of intercooler are you using if a std cossy one that could be your limiting factor.

 

Jamie, thanks for your reply. Standard intercooler at moment, although I could think about a bigger one if I thought it was worth it.
I am still running on the original L6 ECU and understand that its a bit limited as regards mapping with this. Maybe I should think about a new ECU ?

engine is standard but with ARP bolts big end, New pocketed Cosworth Forged pistons, and Kent double valve springs.

 

I think the intercooler will be your main issue when upping the power, pushing past the 320 point you will also require a lot of other supporting upgrades, head gasket, injectors, turbo, clutch, fuel pump, breather system, engine cooling the list go's on.

The intercooler and radiator would be the first thing I would look at ether having something custom made or retro fitting a mk1 escort yb set up as below also do a search on here there have been a few big bhp dax builds.
http://www.turbosport.co.uk/showthread.php?t=648440

Once you have the intercooler sorted get it mapped and set up by someone reputable and be prepared to travel a little. Everyone has there own opinion on tuners and I can only comment on the person I use.

In Your location would make sense to look at

NMS motorsport
Motor sport developments
SCS Harvey Gibbs
Turbo systems

Also drop sonicboom a Pm he's not to far away from you and is also well in to hill climbing he will be better to advise on a suitable hill climbing spec.

 

Thanks for all the info Jamie. I do have group A head gasket and uprated fuel pump plus uprated breather system.
Anyway I will have a look at some of the suggestions you have made. Thanks for your help. Laurie

 

Get a vipec or autronics ecu on it and have it all mapped by someone that knows their cossies. Then if you want a better turbo you can bolt it on and have it mapped.

Mark Shead at MAD did mine.

 

Depending on what type of cooler you have the std 4x4 type is 20% bigger and will see 340 bhp if ducted well. 803 injectors will be fine upto 350bhp ive seen them on the limit at 360.

What boost are your running?

Paul

 

Thanks Caddyshack I will have a look at those ecus.
To answer your question Paul Its running at 18psi at the moment

 

For 803's peak around 26 hold 22 psi. Best buy yourself a wideband gauge like stack, innovate or aem.

One I done for a mate ran a T34/48 on a L6 produced 346bhp. only difference was a airtec intercooler.

regards

Paul

 

Thanks Paul. That gives me a lot to look at. Think I will have a look at intercoolers. See if I can accommadate something a bit bigger. If the four wheel drive one is bigger maybe I should have a look if that will fit in my setup. What I dont want to do is loose any torque at lower revs 3000 to 4000
Cheers

 

You really need to stay with a 48 rear housing. I run a T34/48 with 55lb siemens for around 370bhp and 400lbft. If you think of rally cars they use a 34mm restrictor in the intake of the turbo which again if mapped correct will give you massive torque but less power. But as they say Torque is power...

To identify a 2wd cooler it will have elbow take off for dump valve where the 4x4 has a straight take off. hope that helps.

Regards
Paul

 

Air Temp Cooling is the key on Cateram/Dax/Seven style cars fit the best/largest intercooler you can, also a T34 on a .48 housing would be ideal, but there are better turbos out there just depends how much money you have to spend.
Plus an after market ECU is a must, makes so much difference.
BTW do you do any of the Midland Hills mate?
Rich

 

Rich, I wonder if a charge cooler set up would fit? or possibly a escos charge cooler with remote rad and pump?? Or as you said if money is no object is a custom from pro alloy..

Either way there is many options.

 

Or course you're totally right, if it's just being used for Hillclimbs and Sprinting, run a Charge Cooler on an independent setup with it's own pump then before every run fill it with fresh cold water and half a bag of ice.

Rich

 

Thanks Paul and Rich. Most of what I do is actually Sprints (Goodwood. Crystal Palace.Brighton Speed Trials etc. I do usually do Loton Hillclimb at least once year and a few weeks back I did a drivers training day at Shelsley Walsh as an introduction to that hill.
I am very restricted for space infront of the engine (and none at the sides or back) so if a 4wd cooler is slightly bigger (20%?) then I am sure we could shoehorn that in especially if the mounting holes and width across the car are similar position to the 2wd. To be honest having given it quite a bit of thought and bearing in mind the suggestions on here, I suppose I would be happy to get around 330bhp with plenty of low down torque. My car is very quick off the line but I would like to get more power to improve my 0-100 time. So maybe new chip bigger cooler and T3 hybrid? or T34?

 

Once you have it cooled right stick a twin scroll Borg Warner on it for quicker spool and 500 bhp potential with no real downsides.

 

I would deffo go chargecooler.

It's actually fairly cheap to do. You don't need to spend the £3000 that pro alloy wanted for a set up.

I have a set up on my Westy that I was thinking of upgrading but did some data logs of ICT and the highest I saw in summer on a long motorway boost period was 39 degrees. I was running 1.3 bar only though and about 430bhp ish. I think my set up was about £250.

The key to performance YBs in 7 a likes is keep them under 2 bar but maximise performance by porting the head, a decent cold air intake and keeping ACT at a decent level. After you've done that get it live mapped on L8 or go aftermarket ecu.

 

Thanks all for the input. One thing I have established is that because I only do Sprints and Hillclimbs which vary in duration from Brighton Speed Trials at 12 seconds to Goodwood at 94 seconds, my intercooler at best will only start working on a longer run (Goodwood)
and prbably does very little to cool it on the other Sprints and Hillclimbs that are all under one minute duration !
Anyway I have decided to have my T3 upgraded keeping my .48 housing plus a better boost control and new chip and then get it mapped, and see where we are then.

I am also looking at Sequential Gearboxes! Elite have had problems in the past but recon they have beefed up the parts that were weak (Gears and dog rings etc) There 300 box is attractive to me but only if its going to be reliable. For what I do the box wont have to work hard except for high powered starts to get clean of the line. Anyone had any recent experience of this box?

 

Are you going to fit a charge cooler mate?

Rich

 

Porkie on here has an IL300 on his YB Westfield putting out over 500 charge cooled bhp.

Because your run times are so short you won't even need a pre rad. Just have a water tank at the highest point in the system and use water at around 1 degree C. Just drain and refill between runs. Ensure you have at LEAST 20ltrs of water.

 

Hi Sonic and Jonty, I have decided to see what we produce with my existing cooler before doing anything else. I dont want to be filling water tanks etc between each run as its just not going to be practical. If I get somewhere between 300 and 330 bhp with the mods proposed then that will do for this winters upgrades! especially as I am looking at gearboxes as well.
I think I would eventually go for a charge cooler maybe next for next winters upgrades.

I would be interested in talking to Porkie about his IL300, how do I get in touch with him on here? (I`m still finding my way around!)

 

Search for Frijj! It's an epic thread that starts with a budget track slag idea and ends with what is probably the zenith of a turbocharged seven.